[实验任务一]：旅行方式的选择
旅游的出行方式有乘坐飞机旅行、乘火车旅行和自行车游，不同的旅游方式有不同的实现过程，客户可以根据自己的需要选择一种合适的旅行方式。
1. 提交源代码；
2. #include<iostream>
3. using namespace std;
4. class TravelStrategy {
5. public:
6. virtual void travel()=0;
7. };
8. class Person {
9. private:
10. TravelStrategy *strategy;
11. public:
12. void setStrategy(TravelStrategy *strategy) {
13. this->strategy=strategy;
14. }
15. void travel() {
16. this->strategy->travel();
17. }
18. };
19. class TrainStrategy : public TravelStrategy{
20. public:
21. void travel() {
22. cout<<"乘火车旅游"<<endl;
23. }
24. };
25. class BicycleStrategy : public TravelStrategy{
26. public:
27. void travel() {
28. cout<<"自行车游"<<endl;
29. }
30. };
31. class AirplaneStrategy: public TravelStrategy{
32. public:
33. void travel() {
34. cout<<"乘坐飞机旅游"<<endl;
35. }
36. };
37. int main(){
38. cout<<"请选择旅游方式"<<endl;
39. Person *pr=new Person();
40. TravelStrategy *strategy=new TrainStrategy();
41. pr->setStrategy(strategy);
42. pr->travel();
43. cout<<"------------------------------"<<endl;
44. cout<<"请选择旅游方式"<<endl;
45. TravelStrategy *strategy2=new BicycleStrategy();
46. pr->setStrategy(strategy2);
47. pr->travel();
48. cout<<"------------------------------"<<endl;
49. cout<<"请选择旅游方式"<<endl;
50. TravelStrategy *strategy3=new AirplaneStrategy();
51. pr->setStrategy(strategy3);
52. pr->travel();
53. }